Mold for making brass castings.



v and useful Improvements in Molds for Makthe object of our invention being the same as UNITED STATES Patented October 18, 1904.

PATENT OFFICE.

FRANK J. FRIESE AND JOHN E. GILBERT, OF ST, LOUIS, MISSOURI,

ASSIGNORS OF 'TWO-THIRDS TO EDWARD A. MORE, OF ST. LOUIS,

MISSOURI.

' MOLD FOR MAKING BRASS CASTING-S.

SPECIFICATION forming part of Letters Patent No. 772,712, dated October 18, 1904.

Application filed March 29, 1904:.-

To all whom it may concern:

Be it known that we, FRANK J. FRIEsE and JOHN E. GILBERT, citizens of the United States, residing in the city of St.Louis and State of Missouri, have invented certain new ing Brass Castings, of which the following is a full, clear, and exact description.

ur present invention relates to an improvedrnold of the general character of that shown, described, and claimed in United States Letters Patent N 0. 745,005, issued November 5%, 1903, to ourselves and Edward A. More,

that mentioned in said patentc'. a, to make a brass casting in a metal mold which will be smooth and perfect when produced and to furnish a mold against which the molten metal will lie smoothly and quietly. In the patent referred to the cavity of the metal mold is described and claimed as being coated with an aluminium paint. The molten brass will lie quietly against the sides of a mold of this sort, and the object molded comes out of the mold with a luster that renders further polishing unnecessary. We have found by a series of experiments that a similar result can be accomplished by mixing aluminium intimately with the iron that forms the body of the mold, the percentage of aluminium being not less than two or more than ten per cent., as less than two per cent. fails to accomplish the desired result and more than ten per cent.

Serial No. 200,656. (No model.)

and the said brass casting when produced will.

be found to have a smooth perfect surface and homogeneous throughout.

We claim as our 1nvent1on- 1. A metallic mold for making brass cast- U ings, which is formed of an intimate mixture of iron with from two to ten per cent. of aluminium, as set forth.

2. A metallic mold for making brass castings, which is formed of an intimate mixture of iron with approximately five per cent. of aluminium, as set forth.

3. A metallic mold for making brass castings which contains iron and aluminium; the alumlnium beingintlmately mixed with theiron throughout the mold.

FRANK J. FRIESE. JOHN E. GILBERT. In presence of BLANOHE HOGAN, E. S. KNIGHT. 

